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Graphs showing the sequential change in percentage of prevertebral soft tissue swelling before surgery and at 2 or 3, 7, 30, and 60–90 days after surgery, which is expressed as the mean ± standard deviation at each cervical spine level. Percent prevertebral soft tissue swelling was highest at 2 or 3 days after surgery and returned to preoperative levels within 30 days after surgery
